<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>蜘蛛网特效</title>

  <style>
    html {
      width: 100%;
      height: 100%;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      height: 100%;
      margin: 0;
      padding: 0;
      background-color: rgb(188, 201, 238);
    }
  </style>

</head>

<body>

  <script>
    !function () {
      function n(n, e, t) {
        return n.getAttribute(e) || t
      }

      function e(n) {
        return document.getElementsByTagName(n)
      }

      function t() {
        var t = e("script"), o = t.length, i = t[o - 1];
        return { l: o, z: n(i, "zIndex", -1), o: n(i, "opacity", .5), c: n(i, "color", "0,0,0"), n: n(i, "count", 99) }
      }

      function o() {
        a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
      }

      function i() {
        r.clearRect(0, 0, a, c);
        var n, e, t, o, m, l;
        s.forEach(function (i, x) {
          for (i.x += i.xa, i.y += i.ya, i.xa *= i.x > a || i.x < 0 ? -1 : 1, i.ya *= i.y > c || i.y < 0 ? -1 : 1, r.fillRect(i.x - .5, i.y - .5, 1, 1), e = x + 1; e < u.length; e++) n = u[e], null !== n.x && null !== n.y && (o = i.x - n.x, m = i.y - n.y, l = o * o + m * m, l < n.max && (n === y && l >= n.max / 2 && (i.x -= .03 * o, i.y -= .03 * m), t = (n.max - l) / n.max, r.beginPath(), r.lineWidth = t / 2, r.strokeStyle = "rgba(" + d.c + "," + (t + .2) + ")", r.moveTo(i.x, i.y), r.lineTo(n.x, n.y), r.stroke()))
        }), x(i)
      }

      var a, c, u, m = document.createElement("canvas"), d = t(), l = "c_n" + d.l, r = m.getContext("2d"),
        x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (n) {
          window.setTimeout(n, 1e3 / 45)
        }, w = Math.random, y = { x: null, y: null, max: 2e4 };
      m.id = l, m.style.cssText = "position:fixed;top:0;left:0;z-index:" + d.z + ";opacity:" + d.o, e("body")[0].appendChild(m), o(), window.onresize = o, window.onmousemove = function (n) {
        n = n || window.event, y.x = n.clientX, y.y = n.clientY
      }, window.onmouseout = function () {
        y.x = null, y.y = null
      };
      for (var s = [], f = 0; d.n > f; f++) {
        var h = w() * a, g = w() * c, v = 2 * w() - 1, p = 2 * w() - 1;
        s.push({ x: h, y: g, xa: v, ya: p, max: 6e3 })
      }
      u = s.concat([y]), setTimeout(function () {
        i()
      }, 100)
    }();

  </script>

</body>

</html>